US development of new tungsten alloy penetrator is expected to replace depleted uranium alloy

According to the China Defense Science and Technology Information Network reported that the US is expected to replace the development of a new type of armor-piercing depleted uranium, tungsten alloys ferrochrome.

University of Massachusetts (MIT) researchers have developed a new type of tungsten powder metallurgy ferrochrome alloy W-7Cr-9Fe, can replace the depleted uranium penetrators alloys. Test results show that, W-7Cr-9Fe alloy nano-indentation hardness up to 21 GPa, which is about twice the nanocrystalline iron-based alloy or coarse-grained tungsten, much higher than the current commercial tungsten alloys.

During the preparation of this alloy are: first nano crystalline powder, then made into a desired shape. Among them, the use of high-energy ball milling the powder is prepared by powder metallurgy process, including the repeated shear prompted alloy powder mix, accompanied by heat-activated recovery process, the alloy to return to equilibrium.

The molding process using an electric field assisted sintering hot pressing process, the researchers noted that when the processing time of 1 minute, the temperature is 1200 ℃, the alloy crystal structure obtained is good, and the maximum hardness. The long processing time and high temperature leads to the metal grain coarsening, strength is lowered. Micrographs show, W-7Cr-9Fe alloy grain structure prepared by MIT researchers can reach 130 nm.


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